Hey there! I've been on a no-carbs diet during this whole week, and although I am happy with the weight loss, I am feeling VERY depressed. There are no extra factors that can provoke this. I looked for info on google and it seems that a restriction on carbs can lead to depressive states.
Now, I don't want to be cranky and crying every day of my life so I thought if I tried eating a bit of carbs (like whole-grain pasta and bread, for instance), it won't be so bad and I will still be able to lose weight.

There is no reason to cut carbs from a diet. Calories make you gain weight , not any specific source.
Eating no carbs means you're consuming an unhealthy amount of fats and proteins. (Very high protein intake is hard on the kidneys.)

When you deplete your glycogen stores, you also lose the water that is stored with it. Weight loss for this reason is generally in the 3-5 lbs range. You have not lost real weight.

When you say "No carb" do you mean NO carbs (i.e., no fruits and veggies) or do you mean no refined carbs (pasta, wheat, bread, etc.).

If you've been on NO carbs at all, then I'd start shoveling some good veggies into your mouth Carbs aren't the enemy, though a few people on these boards have successfully maintained low-carb diets with a good selection of fruits and veggies with less refined carbs into the mix. It seems to work for them, and I wouldn't say a low-carb diet is wrong. I think the types and amounts of carbs you choose are important.

Sorry guys, I meant no refined carbs (like bread and such), I did eat vegetables (like green beans and lettuce), but today, for instance, I had lentils for lunch and I feel so much better right now, full of energy and happy. I guess I can try to keep my diet low-carb but still keep eating some.

I'll jump on this band wagon. I agree carbs are not the enemy. Just try to eat get most of them from complex sources like whole grains, fruits and vegetables. Try to keep your maco-nutrient balance of Carbs/Protein/Fat to apprx. 40/30/30 and keep your calories in check and you will lose weight and be healthy.